Should there be some sort of restrictor in the HS4 engine breather port?
Couldn't get my 998 auto to run below about 2500 rpm, after much searching and playing around I discovered if I pull the breather pipe off and plug the port it runs OK. This port has a 1/4" hole directly into the carb body, which doesn't seem right to me as it just allows a huge amount of air in to weaken the mixture. I did search this forum and seem to remember someone mentioning a restrictor with a 3/32" hole in it, but of course, can't find the reference now. I also can't see any indication in any of the parts diagrams available.
Can anyone enlighten me please?